Piping Fittings

Abstract

To provide a joint for a pipeline which can omit work of attaching a socket to a nipple by swaging.SOLUTION: A coupling outer peripheral surface 1804, coupling wall parts 1806, and coupling recessed parts 1808 are provided at a base part 12 side end of a nipple 18. Annular wall parts 2004 and insertion / removal missing parts 2006 are provided at an end of the socket 20 located at the base part 12 side. An engagement recessed part 24A is provided at one of each coupling wall front surface 1806A and each annular wall back surface 2004B, and an engagement protruding part 24B which may engage with the engagement recessed part 24A is provided at the other. A joint for a pipeline is provided with an attachment ring 22 which is attached to a space between the end of the socket 20 and a large diameter part in a state that the engagement recessed parts 24A and the engagement protruding parts 24B are engaged to restrict the socket 20 from moving to the large diameter part side and hold a state that the engagement recessed parts 24A and the engagement protruding parts 24B are engaged.SELECTED DRAWING: Figure 17

Description

[Technical field]

[0001] The present invention relates to a pipe joint having a nipple and a socket. [Background technology]

[0002] A piping joint having a nipple and a socket is connected to an end of a hose, and serves to supply the fluid flowing through the hose to an appropriate device or to discharge the fluid from the device. Conventionally, when connecting a piping joint having a nipple and a socket to the end of a hose in a factory, the nipple is first inserted into the socket and then a special crimping machine is used to crimp the end of the socket into the annular recess in the end of the nipple to attach it. Next, the end of the hose is inserted into the annular space between the outer peripheral surface of the nipple and the inner peripheral surface of the socket, and the socket is crimped using a crimping machine to integrate the end of the hose with the socket and nipple. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-278975 A Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, with conventional piping joints, it was necessary to use a special crimping machine to attach the socket to the nipple, which meant that the piping joints could not be manufactured easily and was disadvantageous in terms of improving the efficiency of the work of connecting the piping joint to the hose. Furthermore, if the socket is attached to the nipple in advance, inventory management is required, which is disadvantageous in terms of reducing costs. The present invention has been devised in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a piping fitting which can be easily manufactured by eliminating the need for the work of crimping a socket to a nipple to attach it, thereby eliminating the need to maintain a stock of piping fittings with sockets already attached to nipples, and which further allows the inner and outer diameters of the socket to be reduced, thereby being advantageous in terms of improving the efficiency and reducing the costs of the work of connecting the piping fitting to a hose. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, one embodiment of the present invention is a piping joint comprising a nozzle portion and a hose coupling portion, the hose coupling portion comprising a nipple having a hose insertion portion, and a socket surrounding the periphery of the hose insertion portion, the nozzle portion side end of the nipple is formed as a coupling outer circumferential surface having the same axis as the hose insertion portion, and a coupling wall portion is provided at the hose insertion portion side end of the coupling outer circumferential surface, the coupling wall portion extending in the circumferential direction of the coupling outer circumferential surface while projecting radially outward from the nozzle portion side end of the coupling outer circumferential surface and having a coupling wall front surface facing the nozzle portion side, the portion of the coupling outer circumferential surface passing through the coupling wall portion except for the coupling wall portion is a coupling recess, the nozzle portion side end of the coupling outer circumferential surface is provided with a large diameter portion having an outer diameter larger than that of the coupling outer circumferential surface, and the nozzle portion side a mounting ring is provided at an end of the socket positioned at the base portion, the mounting ring having an annular wall back surface that extends along the inner peripheral surface while protruding radially inward from the inner peripheral surface of the end of the socket at an inner diameter into which the coupling outer peripheral surface is inserted, the annular wall back surface facing in a direction away from the base portion, and the portion of the inner peripheral surface of the socket that passes through the annular wall in the circumferential direction, excluding the annular wall portion, is an insertion / removal notch, a locking recess is provided on one of the coupling wall front surface and the annular wall back surface, and a locking protrusion that can be engaged with the locking recess is provided on the other, and when the coupling wall enters the inside of the socket from the insertion / removal notch and the locking recess and the locking protrusion are engaged, a mounting ring is provided between the end of the socket and the large diameter portion, restricting movement of the socket toward the large diameter portion and maintaining a state in which the locking recess and the locking protrusion are engaged. Moreover, one embodiment of the present invention is a piping joint comprising a nozzle portion and a hose coupling portion, the hose coupling portion comprising a nipple having a hose insertion portion, and a socket surrounding the periphery of the hose insertion portion, an end portion of the nipple on the nozzle portion side is formed as a coupling outer circumferential surface having the same axis as the hose insertion portion, and a coupling wall portion is provided at the end portion of the coupling outer circumferential surface on the hose insertion portion side, the coupling wall portion extending in the circumferential direction of the coupling outer circumferential surface while projecting radially outward from the nozzle portion side end portion of the coupling outer circumferential surface and having a coupling wall front surface facing the nozzle portion side, and a portion of the coupling outer circumferential surface passing through the coupling wall portion in the circumferential direction thereof excluding the coupling wall portion is a coupling recess, and the coupling wall portion is provided at the end portion of the coupling outer circumferential surface on the nozzle portion side. a large diameter portion having an outer diameter larger than the coupling outer peripheral surface is provided, and an annular wall portion is provided at the end of the socket located on the base portion side, the annular wall portion having an annular wall back surface facing in a direction away from the base portion, the annular wall portion extending along the inner peripheral surface while protruding radially inward from the inner peripheral surface of the end of the socket at an inner diameter into which the coupling outer peripheral surface is inserted, the annular wall back surface facing in a direction away from the base portion being provided at a portion of the inner peripheral surface of the end of the socket that passes through the annular wall portion in the circumferential direction of the inner peripheral surface of the end of the socket, excluding the annular wall portion, which is a recess for insertion / removal, and a spacer is provided that is pressed between the end of the socket located on the base portion side and the large diameter portion, with the coupling wall portion entering the inside of the socket from the recess for insertion / removal and the coupling wall front surface and the annular wall back surface opposing each other. In addition, one embodiment of the present invention is characterized in that the connecting wall portions and the connecting recesses are provided in multiple locations spaced apart in the circumferential direction of the connecting outer peripheral surface, and the annular wall portions and the insertion / removal recesses are provided in multiple locations spaced apart in the circumferential direction of the inner peripheral surface of the end portion of the socket. In one embodiment of the present invention, a locking recess is provided on one of the connecting wall front surface and the annular wall rear surface, and a locking protrusion capable of being locked in the locking recess is provided on the other. In addition, one embodiment of the present invention is characterized in that the width of the connecting wall portion along the circumferential direction of the connecting outer peripheral surface and the width of the annular wall portion along the circumferential direction of the inner peripheral surface of the end of the socket are approximately equal. In addition, one embodiment of the present invention is characterized in that the mounting ring is formed of an annular body extending over more than half of the entire circumference of the connecting outer peripheral surface and is mounted on the connecting outer peripheral surface, and the annular body has a recess formed between both ends in the extension direction thereof for mounting the annular body on the connecting outer peripheral surface. In addition, one embodiment of the present invention is characterized in that the spacer is formed of an annular body extending over more than half of the entire circumference of the outer circumferential surface for connection, and a notch is formed between both ends of the annular body in the extension direction for positioning the annular body around the outer circumferential surface for connection, and an inclined surface is formed on the inner circumferential portion of the annular body so that the thickness of the annular body becomes thinner as it approaches the inner end. Effect of the Invention

[0006] According to one embodiment of the present invention, when the locking recess and the locking protrusion are engaged, an attachment ring attached between the end of the socket and the large diameter portion restricts movement of the socket toward the large diameter portion, thereby forming a piping joint in which the locking recess and the locking protrusion are maintained in an engaged state. Furthermore, according to one embodiment of the present invention, a spacer is pressed between the end of the socket and the large diameter portion, thereby pressing the front surface of the connecting wall and the rear surface of the annular wall together, thereby forming a piping joint in which relative rotation between the front surface of the connecting wall and the rear surface of the annular wall is prevented. Therefore, there is no longer any need to use a dedicated crimping machine to crimp the end of the socket into the annular recess at the end of the nipple, as was done in the past, and the piping fitting can be manufactured easily, which is advantageous in terms of improving the efficiency of the work of connecting the piping fitting to the hose. In addition, since the process of using a crimping machine to crimp the socket to the nipple to connect them can be omitted, inventory management that was required in the past when the socket was attached to the nipple in advance is also unnecessary, which is advantageous in reducing the cost of piping fittings. Furthermore, in one embodiment of the piping joint of the present invention, the socket has a uniform outer diameter when attached to the nipple, which is advantageous in reducing the diameter of the socket and is advantageous in reducing the weight and cost of the piping joint. Furthermore, providing a plurality of coupling walls, coupling recesses, annular walls, and insertion / removal notches is advantageous in preventing relative rotation between the nipple and the socket in a stable manner. In addition, when a spacer is used, providing a locking recess and a locking protrusion on the front surface of the connecting wall and the back surface of the annular wall that can be locked to each other is advantageous in preventing relative rotation between the nipple and the socket and in easily aligning the connecting wall with the annular wall. Furthermore, if the width of the connecting wall portion along the circumferential direction of the connecting outer peripheral surface and the width of the annular wall portion along the circumferential direction of the inner peripheral surface of the end of the socket are formed to be approximately equal, it is advantageous for easily aligning the multiple connecting wall portions with the multiple annular wall portions by inserting the multiple connecting wall portions into the interior of the socket through the insertion / removal notches and rotating the nipple and socket relatively, and therefore advantageous for easily manufacturing the piping fitting and for improving the efficiency of the work of connecting the piping fitting and the hose. Furthermore, if the mounting ring is constructed as an annular body extending over at least half of the entire circumference of the connecting outer peripheral surface, this is advantageous in stabilizing the mounting state of the connecting outer peripheral surface of the mounting ring, and is advantageous in maintaining a stable engagement state between the locking recess and the locking protrusion. Furthermore, if the spacer is constructed as an annular body extending over at least half of the entire circumference of the connecting outer peripheral surface, the front surface of the connecting wall and the back surface of the annular wall are evenly pressed together in the circumferential direction of the connecting outer peripheral surface, which is advantageous in reliably preventing relative rotation between the front surface of the connecting wall and the back surface of the annular wall. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a perspective view of a base portion and a nipple according to the first embodiment. [Diagram 2] FIG. 2 is a perspective view of a base portion and a nipple according to the first embodiment. [Diagram 3] FIG. 2 is a side view of a base portion and a nipple according to the first embodiment. [Figure 4] FIG. 1 is a perspective view of a socket according to a first embodiment. [Diagram 5] FIG. 1 is a perspective view of a socket according to a first embodiment. [Figure 6] FIG. 2 is a cross-sectional side view of the socket according to the first embodiment. [Figure 7] FIG. 2A is a perspective view of a mounting ring according to the first embodiment, FIG. 2B is a front view of the same, and FIG. [Figure 8] 13 is a perspective view of a state in which the coupling wall portion is inserted into the inside of the socket through the insertion / removal notch. FIG. [Figure 9] 13 is a perspective view of the base portion, the nipple, and the socket in a state in which the coupling wall portion is inserted into the inside of the socket through the insertion / removal notch. FIG. [Figure 10] 13 is a side view of the base portion, nipple, and socket with the locking recess and locking protrusion locked together. FIG. [Figure 11] 13 is an explanatory diagram of mounting the mounting ring to the outer circumferential joining surface between the end of the socket and the hexagonal portion. FIG. [Figure 12] FIG. 2 is a perspective view of a pipe fitting with a mounting ring attached; [Figure 13] This is not a cross-sectional view, but rather a hatched view to clarify the positional relationship between the connecting wall of the nipple and the annular wall of the socket. (A) is a view from the end of the socket showing the state in which the connecting wall has been inserted into the socket through the insertion / removal notch, and (B) is a view from the end of the socket showing the state in which the socket has been rotated so that the locking recess and locking protrusion are engaged. [Figure 14] 13 is a cross-sectional side view of a state in which the coupling wall portion is inserted into the inside of the socket through the insertion / removal notch. FIG. [Figure 15] 13 is a cross-sectional side view of the socket rotated to align the coupling wall and the annular wall. FIG. [Figure 16] 13 is a cross-sectional side view of a state in which the locking recess and the locking protrusion are locked together. FIG. [Figure 17] FIG. 4 is a cross-sectional side view of the mounting ring when attached. [Figure 18] FIG. 17 is an enlarged view of FIG. [Figure 19] FIG. 4 is an enlarged cross-sectional side view of a state in which a retaining ring is attached to the outer circumferential surface for connection. [Figure 20] 13 is an enlarged cross-sectional side view showing a state in which a spacer is press-fitted between a hexagonal portion and an end of a socket. FIG. [Figure 21] 13(A) to 13(D) are perspective views of modified examples of the joint body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] (First embodiment) Next, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 12, the piping joint 10 comprises a nozzle portion 12, a hose joint portion 14, and an attachment ring 22, and a fluid passage 16 is formed through the inside of the nozzle portion 12 and the hose joint portion 14, as shown in FIG. 17. As shown in Figures 1 to 3 and 17, the base portion 12 is configured to include a large diameter portion formed as a hexagonal portion 1202, an annular recess 1204 continuing to the hexagonal portion 1202, an annular convex portion 1206 continuing to the annular recess 1204, and a nut 1208 rotatably connected to the annular recess 1204. In addition, the large diameter portion may be formed as a cylindrical surface rather than as a hexagonal portion 1202, and the nozzle portion 12 is not limited to the structure of this embodiment, but may simply be composed of a male thread, or may be composed of a cylindrical body that is brazed to the mating fluid passage, or may be composed of a hose coupling portion 14, and various other structures known in the art can be applied.

[0009] As shown in FIG. 17, the hose coupling portion 14 includes a nipple 18, a socket 20, and an attachment ring 22. The nipple 18 is provided coaxially with the base portion 12 . As shown in FIGS. 1 to 3, the nipple 18 includes a hose insertion portion 1802, a coupling outer circumferential surface 1804, a coupling wall portion 1806, and a coupling recess 1808. As shown in FIG. Hose insertion portion 1802 is the portion that is inserted into the inside of the hose, and has projections and recesses 1810 on its surface for coupling with the hose. The outer circumferential surface for connection 1804 has the same axis as the hose insertion portion 1802 , and is provided at the end of the nipple 18 on the side of the mouthpiece 12 with an outer diameter larger than the outer diameter of the hose insertion portion 1802 . The coupling wall portion 1806 is provided at an end portion of the coupling outer peripheral surface 1804 on the hose insertion portion 1802 side and at a location spaced from the end portion of the coupling outer peripheral surface 1804 on the mouthpiece portion 12 side. The coupling walls 1806 are provided at equally spaced locations around the circumference of the coupling outer circumferential surface 1804 , protruding radially outward from the coupling outer circumferential surface 1804 and extending around the coupling outer circumferential surface 1804 . In this embodiment, a plurality of these are provided at locations on the outer circumferential surface 1804 for coupling spaced apart from the hexagonal end surface 1202A of the hexagonal portion 1202 and spaced at equal intervals in the circumferential direction of the outer circumferential surface. The multiple coupling walls 1806 are formed in the same shape.

[0010] Further, in the circumferential direction of the coupling outer peripheral surface 1804 passing through the coupling wall portion 1806, the portion excluding the coupling wall portion 1806 forms a coupling recess 1808. In other words, the portions of the coupling wall portions 1806 adjacent to each other in the circumferential direction of the coupling outer peripheral surface 1804 form coupling recesses 1808. Each of the coupling walls 1806 has a coupling wall front surface 1806A facing the base portion 12 side, and a locking recess 24A recessed in a direction away from the base portion 12 is provided on the coupling wall front surface 1806A. In this embodiment, the joint body 26 is formed by the annular convex portion 1206, the annular concave portion 1204, the hexagonal portion 1202, the connecting outer peripheral surface 1804, the connecting wall portion 1806, the connecting concave portion 1808, and the hose insertion portion 1802.

[0011] As shown in FIGS. 4 to 6, socket 20 has a socket body 2002 with a uniform outer diameter, and an annular wall portion 2004 and a notch 2006 for insertion and removal provided at the end of socket body 2002 located on the base portion 12 side. The socket body 2002 has an inner peripheral surface provided with a projection 2008 for coupling with a hose. A plurality of annular walls 2004 are provided at equal intervals in the circumferential direction on the inner peripheral surface of the end portion of the socket 20 . The annular wall portion 2004 extends annularly along the inner peripheral surface while protruding radially inward from the inner peripheral surface of the end portion of the socket 20 at an inner diameter into which the outer coupling surface 1804 is inserted. The annular wall portion 2004 has an annular wall front surface 2004 A facing toward the ferrule portion 12 and an annular wall back surface 2004 B facing toward the tip of the hose insertion portion 1802 . The annular wall rear surface 2004B is provided with a locking protrusion 24B that can be locked into the locking recess 24A. Further, the portion of the inner circumferential surface of the end of the socket 20 passing through the annular wall portion 2004 in the circumferential direction, excluding the annular wall portion 2004 , forms a cutout portion 2006 for insertion / removal. In this embodiment, the width of the connecting wall portion 1806 along the circumferential direction of the connecting outer peripheral surface 1804 and the width of the annular wall portion 2004 along the circumferential direction of the inner peripheral surface of the end of the socket 20 are formed to be approximately the same dimension. In addition, the width of the coupling recess 1808 along the circumferential direction of the coupling outer peripheral surface 1804 and the width of the insertion / removal recess 2006 along the circumferential direction of the inner peripheral surface of the end of the socket 20 are also formed to be approximately the same dimension. The width of the coupling wall portion 1806 along the circumferential direction of the coupling outer peripheral surface 1804, the width of the annular wall portion 2004 along the circumferential direction of the inner peripheral surface of the end portion of the socket 20, the width of the coupling recess 1808 along the circumferential direction of the coupling outer peripheral surface 1804, and the width of the insertion / removal recess 2006 along the circumferential direction of the inner peripheral surface of the end portion of the socket 20 are all formed to be approximately the same dimensions.

[0012] As shown in FIG. 7 , the mounting ring 22 is provided so as to be attachable to the outer circumferential surface 1804 for coupling, and is formed of an annular body 2202 extending over at least half of the entire circumference of the outer circumferential surface 1804 for coupling, and a notch 2204 is formed between both ends of the annular body 2202 in the extension direction for allowing the mounting ring 22 to be detachably attached to the outer circumferential surface 1804 for coupling. As shown in FIG. 17, the mounting ring 22 is mounted between the end of the socket 20 and the hexagonal portion 1202 with the coupling wall portion 1806 entering the inside of the socket 20 through the insertion / removal notch 2006 and the locking recess 24A and the locking protrusion 24B engaged with each other, thereby restricting movement of the socket 20 toward the large diameter portion and maintaining the state in which the locking recess 24A and the locking protrusion 24B are engaged with each other. As shown in FIG. 18, when the connecting wall front surface 1806A and the annular wall back surface 2004B are in contact and the locking recess 24A and the locking protrusion 24B are engaged, if the length by which the locking protrusion 24B penetrates the locking recess 24A is L1, the distance between the hexagonal end face 1202A and the annular wall front surface 2004A is L2, and the thickness of the mounting ring 22 is T, then the relationship L1>(L2-T) is satisfied.

[0013] Next, a method of using the piping joint 10 will be described. First, the joint body 26 on which the nut 1208 shown in FIGS. 1 to 3 is rotatably provided, the socket 20 shown in FIGS. 4 to 6, and the mounting ring 22 shown in FIG. 7 are prepared. Next, the worker inserts the nipple 18 into the socket 20 so that the nipple 18 is inside the socket 20, as shown in Figure 8, and then inserts the multiple connecting wall portions 1806 into the interior of the socket 20 through the insertion / removal recesses 2006, as shown in Figures 8, 9, 13(A), and 14. Then, the operator rotates the nipple 18 and the socket 20 relative to each other, and when the connecting wall front surface 1806A at the end of the extending direction of the multiple connecting wall portions 1806 is positioned on the annular wall back surface 2004B of the annular wall portion 2004, the operator rotates the nipple 18 and the socket 20 relative to each other while moving them apart in their axial direction. When the nipple 18 and the socket 20 are rotated relative to each other while moving them apart in their axial direction, as shown in Figures 11, 13(B) and 16, the locking protrusion 24B engages with the locking recess 24A with the locking protrusion 24B positioned on the locking recess 24A, so that the operator can see that the nipple 18 and the socket 20 have been positioned circumferentially on the inner surface of the socket 20. In this state, the entirety of the coupling wall front surfaces 1806A of the multiple coupling wall portions 1806 is positioned over the entirety of the annular wall rear surfaces 2004B of the multiple annular wall portions 2004, respectively, and the coupling recesses 1808 and the insertion / removal cutouts 2006 match up.

[0014] Next, the operator installs the mounting ring 22 onto the mating outer periphery 1804 between the hexagonal end surface 1202A and the annular wall front surface 2004A, as shown in FIGS. This restricts the movement of socket 20 towards hexagonal portion 1202, and maintains the state in which locking recess 24A and locking protrusion 24B are locked together. Once the mounting ring 22 has been attached to the outer circumferential surface 1804 for connection, a hose is inserted into the annular space between the outer circumferential surface of the hose insertion portion 1802 and the inner circumferential surface of the socket 20, and the socket 20 is crimped with a crimping machine to integrally connect the hose, socket 20, and nipple 18.

[0015] Therefore, according to the piping joint 10 of the present embodiment, there is no longer any need to use a dedicated crimping machine to crimp the end of the socket 20 into the annular recess at the end of the nipple 18, as was done in the conventional case. The piping joint 10 is constructed by inserting the nipple 18 into the inside of the socket 20, engaging the locking recess 24A with the locking protrusion 24B, and attaching the mounting ring 22 to the connecting outer circumferential surface 1804, so that the piping joint 10 can be manufactured easily, which is advantageous in improving the efficiency of the work of connecting the piping joint 10 to the hose. In addition, since the process of crimping the end of the socket 20 into the annular recess at the end of the nipple 18 to connect the socket 20 to the nipple 18 can be omitted, inventory management which was required in the conventional method of attaching the socket 20 to the nipple 18 in advance is also unnecessary, which is advantageous in reducing the cost of the piping fitting 10. Furthermore, in conventional piping joints in which the end of the socket 20 is crimped into the annular recess at the end of the nipple 18 to connect the socket 20 to the nipple 18, the inner diameter of the socket 20 on the annular recess side gradually becomes smaller as it approaches the annular recess because the end of the socket 20 is crimped into the annular recess. Therefore, in many cases, the inner and outer diameters of the socket 20 are made larger to allow the end of the hose to fit up to a specified point inside the socket 20. In contrast, in the piping joint 10 of the present embodiment, there is no need to crimp the end of the socket 20 into the annular recess at the end of the nipple 18 as in the conventional case, and the socket 20 has a uniform outer diameter when attached to the nipple 18, which is advantageous in reducing the diameter of the socket 20 and in reducing the weight and cost of the piping joint 10. Furthermore, in this embodiment, the mounting ring 22 is formed of annular body 2202 extending over more than half of the entire circumference of the connecting outer peripheral surface 1804, which is advantageous in stabilizing the mounting state of the mounting ring 22 relative to the connecting outer peripheral surface 1804 and in maintaining a stable engagement state between the locking recess 24A and the locking protrusion 24B.

[0016] (Second embodiment) Next, a second embodiment will be described with reference to FIG. In the following description of the embodiment, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and their description will be omitted or simplified, with the focus being on the differences. In the second embodiment, a retaining ring 28 such as a snap ring or an E-ring is used as the mounting ring 22. The retaining ring 28 is attached to the mounting groove 1820 formed in the connecting outer surface 1804 located between the hexagonal end face 1202A and the annular wall front surface 2004A when the connecting wall portion 1806 enters the inside of the socket 20 through the insertion / removal notch 2006, the connecting wall front surface 1806A abuts against the annular wall back surface 2004B, and the locking recess 24A and the locking protrusion 24B are engaged, thereby restricting movement of the socket 20 toward the large diameter portion and maintaining the locked state between the locking recess 24A and the locking protrusion 24B. When the connecting wall front surface 1806A and the annular wall back surface 2004B are in contact and the locking recess 24A and the locking protrusion 24B are engaged, if the length by which the locking protrusion 24B penetrates into the locking recess 24A is L1 and the distance between the side of the retaining ring 28 and the annular wall front surface 2004A is L3, then the relationship L1>L3 is satisfied. The second embodiment as described above also provides the same effects as the first embodiment.

[0017] (Third embodiment) Next, a third embodiment will be described with reference to FIG. In the third embodiment, a spacer 30 is used in place of the mounting ring 22. The spacer 30 is formed of an annular body 3002 extending over at least half of the entire circumference of the outer circumferential surface 1804 for coupling, and a notch is formed between both ends of the annular body 3002 in the extension direction to allow the annular body 3002 to be positioned around the outer circumferential surface 1804 for coupling. In addition, an inclined surface 3010 is formed on the inner periphery of the ring-shaped body 3002, which makes the thickness of the ring-shaped body 3002 thinner toward the inner periphery, so as to facilitate press-fitting between the hexagonal end face 1202A and the ring-shaped wall front face 2004A. The spacer 30 is pressed into between the hexagonal end face 1202A and the annular wall front face 2004A with the connecting wall portion 1806 entering the inside of the socket 20 through the insertion / removal notch 2006, the connecting wall front face 1806A abutting against the annular wall back face 2004B, and the locking recess 24A engaging with the locking protrusion 24B, thereby pressing the connecting wall front face 1806A against the annular wall back face 2004B. By preventing relative rotation between the connecting wall front surface 1806A and the annular wall back surface 2004B, the locking recess 24A and the locking protrusion 24B are maintained in an engaged state, preventing the socket 20 from moving toward the larger diameter portion. The spacer 30 is press-fitted by, for example, hitting the spacer 30 with a hammer or by using a jig.

[0018] In the third embodiment, the spacer 30 presses the coupling wall front surface 1806A and the annular wall back surface 2004B together, preventing relative rotation between the coupling wall front surface 1806A and the annular wall back surface 2004B, and therefore it is possible to omit the locking recess 24A and the locking protrusion 24B. However, providing the locking recess 24A and the locking protrusion 24B is advantageous in reliably preventing relative rotation in the circumferential direction between the coupling body 26 and the socket 20, and also simplifies the alignment of the coupling wall portion 1806 with respect to the annular wall portion 2004, improving the efficiency of the assembly work of the socket 20 to the nipple 18, which is therefore advantageous in reducing the cost of the piping coupling 10 and in improving the efficiency of the connection work between the piping coupling 10 and the hose. Also, the spacer 30 may be formed of a rectangular plate rather than the ring-shaped body 3002. However, if the spacer 30 is formed of the ring-shaped body 3002 extending over at least 1 / 2 of the entire circumference of the connecting outer peripheral surface 1804 as in the embodiment, the connecting wall front surface 1806A and the annular wall back surface 2004B are evenly pressed against each other in the circumferential direction of the connecting outer peripheral surface 1804, which is advantageous in reliably preventing relative rotation between the connecting wall front surface 1806A and the annular wall back surface 2004B. The third embodiment as described above also provides the same effects as the first embodiment.

[0019] In the first to third embodiments, the case where three each of the coupling wall portion 1806, coupling recess 1808, annular wall portion 2004, and insertion / removal cutout portion 2006 are provided has been described, but it is also possible to provide one each of the coupling wall portion 1806, coupling recess 1808, annular wall portion 2004, and insertion / removal cutout portion 2006. However, providing a plurality of the coupling wall portion 1806, coupling recess 1808, annular wall portion 2004, and insertion / removal cutout portion 2006 as in the embodiments is advantageous in preventing rotation of the socket 20 relative to the nipple 18 in a stable manner. Figure 21(A) shows a case where two each of coupling walls 1806 and coupling recesses 1808 are provided on the coupling outer peripheral surface 1804 of nipple 18, Figure 21(B) shows a case where four each of coupling walls 1806 and coupling recesses 1808 are provided on the coupling outer peripheral surface 1804 of nipple 18, Figure 21(C) shows a case where five each of coupling walls 1806 and coupling recesses 1808 are provided on the coupling outer peripheral surface 1804 of nipple 18, and Figure 21(D) shows a case where six each of coupling walls 1806 and coupling recesses 1808 are provided on the coupling outer peripheral surface 1804 of nipple 18.

[0020] Furthermore, in the first to third embodiments, the width of the connecting wall portion 1806 along the circumferential direction of the connecting outer peripheral surface 1804 and the width of the annular wall portion 2004 along the circumferential direction of the inner peripheral surface of the end of the socket 20 are formed to be approximately equal to each other. Therefore, when the multiple connecting wall portions 1806 are inserted into the socket 20 from the insertion / removal notches 2006 and the nipple 18 and the socket 20 are rotated relatively to align the multiple connecting wall portions 1806 with the multiple annular wall portions 2004, this is advantageous in easily aligning the multiple connecting wall portions 1806 with the multiple annular wall portions 2004, which is advantageous in easily manufacturing the piping fitting 10, and which is advantageous in improving the efficiency of the work of connecting the piping fitting 10 to the hose.

[0021] It is to be noted that the piping fitting 10 may be distributed on the market in a separate form without assembling the fitting body 26, socket 20, mounting ring 22, retaining ring 28, and spacer 30, and also the piping fitting 10 may be distributed on the market in a form in which the fitting body 26, socket 20, mounting ring 22, retaining ring 28, and spacer 30 are assembled. [Explanation of symbols]

[0022] 10. Piping joints 12 Cap part 1202 Hexagonal part 1202A Hexagonal end face 1204 Circular recess 1206 Annular protrusion 1208 Nut 14 Hose joint 16 Fluid passage 18 Nipples 1802 Hose insertion part 1804 Outer surface for coupling 1806 Joining wall 1806A Joining wall front 1808 Joint recess 1810 Uneven part 1820 Mounting groove 20 Sockets 2002 Socket body 2004 Annular wall 2004A Circular wall front 2004B Circular wall back 2006 Notch for insertion / removal 2008 protrusion 22 Mounting Ring 2202 Circular body 2204 Missing part 24A Locking recess 24B Locking protrusion 26 Fitting body 28 Retaining ring 30 Spacer 3002 Circular body 3010 Slope

Claims

1. A piping joint comprising a mouthpiece and a hose joint, the hose joint comprising a nipple having a hose insertion portion and a socket surrounding the periphery of the hose insertion portion, The end of the nipple on the side of the nozzle portion is formed as an outer circumferential surface for connection having the same axis as the hose insertion portion, and a connection wall portion is provided at the end of the outer circumferential surface for connection on the side of the hose insertion portion, the connection wall portion protruding radially outward from the end of the outer circumferential surface for connection on the side of the nozzle portion and extending in the circumferential direction of the outer circumferential surface for connection, the connection wall portion having a front surface for connection facing the side of the nozzle portion, A portion of the outer circumferential surface passing through the connecting wall portion in a circumferential direction thereof except for the connecting wall portion is a connecting recess portion, a large diameter portion having an outer diameter larger than that of the outer circumferential surface for coupling is provided at an end portion of the outer circumferential surface for coupling on the side of the base portion; an annular wall portion is provided at an end of the socket located on the base portion side, the annular wall portion having an annular wall back surface that protrudes radially inward from an inner circumferential surface of the end of the socket at an inner diameter into which the outer circumferential surface for coupling is inserted and extends along the inner circumferential surface and faces in a direction away from the base portion, a portion of an inner peripheral surface of an end portion of the socket that passes through the annular wall portion in a circumferential direction, except for the annular wall portion, that is a notch for insertion and removal; a locking recess is provided on one of the front surface of the connecting wall and the rear surface of the annular wall, and a locking protrusion capable of being locked in the locking recess is provided on the other of the front surface and the rear surface of the annular wall; a mounting ring is provided between the end of the socket and the large diameter portion in a state in which the coupling wall portion enters the inside of the socket through the insertion / removal notch and the locking recess and the locking protrusion are locked, the mounting ring being mounted to limit movement of the socket toward the large diameter portion and maintaining the locking recess and the locking protrusion locked. A piping joint characterized by:

2. A piping joint comprising a mouthpiece and a hose joint, the hose joint comprising a nipple having a hose insertion portion and a socket surrounding the periphery of the hose insertion portion, The end of the nipple on the side of the nozzle portion is formed as an outer circumferential surface for connection having the same axis as the hose insertion portion, and a connection wall portion is provided at the end of the outer circumferential surface for connection on the side of the hose insertion portion, the connection wall portion protruding radially outward from the end of the outer circumferential surface for connection on the side of the nozzle portion and extending in the circumferential direction of the outer circumferential surface for connection, the connection wall portion having a front surface for connection facing the side of the nozzle portion, A portion of the outer circumferential surface passing through the connecting wall portion in a circumferential direction thereof except for the connecting wall portion is a connecting recess portion, a large diameter portion having an outer diameter larger than that of the outer circumferential surface for coupling is provided at an end portion of the outer circumferential surface for coupling on the side of the base portion; an annular wall portion is provided at an end of the socket located on the base portion side, the annular wall portion having an annular wall back surface that protrudes radially inward from an inner circumferential surface of the end of the socket at an inner diameter into which the outer circumferential surface for coupling is inserted and extends along the inner circumferential surface and faces in a direction away from the base portion, a portion of an inner peripheral surface of an end portion of the socket that passes through the annular wall portion in a circumferential direction, except for the annular wall portion, that is a notch for insertion and removal; a spacer is provided between an end of the socket located on the base portion side and the large diameter portion, in a state in which the coupling wall portion enters the inside of the socket through the insertion / removal notch and the coupling wall front surface faces the annular wall back surface, so as to press the coupling wall front surface and the annular wall back surface against each other; A piping joint characterized by:

3. The coupling wall portion and the coupling recess portion are provided at intervals in a circumferential direction of the coupling outer peripheral surface, The annular wall portion and the insertion / removal cutout portion are provided at intervals in the circumferential direction on the inner circumferential surface of the end portion of the socket.

3. A piping joint according to claim 1 or 2.

4. a locking recess is provided on one of the front surface of the connecting wall and the rear surface of the annular wall, and a locking protrusion capable of being locked in the locking recess is provided on the other of the front surface and the rear surface of the annular wall; A piping joint according to claim 2 or claim 3 which cites claim 2.

5. a width of the coupling wall along the circumferential direction of the coupling outer peripheral surface and a width of the annular wall along the circumferential direction of the inner peripheral surface of the end of the socket are substantially equal; 5. A piping joint according to claim 1, wherein the piping joint is a pipe joint.

6. the mounting ring is formed as an annular body that extends over at least half of the entire circumference of the outer circumferential surface for coupling and is mounted on the outer circumferential surface for coupling; A notch is formed between both ends of the annular body in the extending direction thereof for mounting the annular body on the connecting outer circumferential surface. A piping joint according to claim 1, claim 3 which refers to claim 1, or claim 5 which refers to claim 1.

7. The spacer is formed as an annular body extending over at least half of the entire circumference of the outer circumferential surface for connection, A notch is formed between both ends of the annular body in the extending direction thereof to allow the annular body to be positioned around the outer circumferential surface for connection, An inclined surface is formed on the inner periphery of the annular body such that the thickness of the annular body becomes thinner toward the inner periphery. A piping joint according to claim 2 or claim 4, or claim 3 which cites claim 2, or claim 5 which cites claim 2.

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